125=-.5x^2+25x-100

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Solution for 125=-.5x^2+25x-100 equation:


Simplifying
125 = -0.5x2 + 25x + -100

Reorder the terms:
125 = -100 + 25x + -0.5x2

Solving
125 = -100 + 25x + -0.5x2

Solving for variable 'x'.

Combine like terms: 125 + 100 = 225
225 + -25x + 0.5x2 = -100 + 25x + -0.5x2 + 100 + -25x + 0.5x2

Reorder the terms:
225 + -25x + 0.5x2 = -100 + 100 + 25x + -25x + -0.5x2 + 0.5x2

Combine like terms: -100 + 100 = 0
225 + -25x + 0.5x2 = 0 + 25x + -25x + -0.5x2 + 0.5x2
225 + -25x + 0.5x2 = 25x + -25x + -0.5x2 + 0.5x2

Combine like terms: 25x + -25x = 0
225 + -25x + 0.5x2 = 0 + -0.5x2 + 0.5x2
225 + -25x + 0.5x2 = -0.5x2 + 0.5x2

Combine like terms: -0.5x2 + 0.5x2 = 0.0
225 + -25x + 0.5x2 = 0.0

Begin completing the square.  Divide all terms by
0.5 the coefficient of the squared term: 

Divide each side by '0.5'.
450 + -50x + x2 = 0

Move the constant term to the right:

Add '-450' to each side of the equation.
450 + -50x + -450 + x2 = 0 + -450

Reorder the terms:
450 + -450 + -50x + x2 = 0 + -450

Combine like terms: 450 + -450 = 0
0 + -50x + x2 = 0 + -450
-50x + x2 = 0 + -450

Combine like terms: 0 + -450 = -450
-50x + x2 = -450

The x term is -50x.  Take half its coefficient (-25).
Square it (625) and add it to both sides.

Add '625' to each side of the equation.
-50x + 625 + x2 = -450 + 625

Reorder the terms:
625 + -50x + x2 = -450 + 625

Combine like terms: -450 + 625 = 175
625 + -50x + x2 = 175

Factor a perfect square on the left side:
(x + -25)(x + -25) = 175

Calculate the square root of the right side: 13.228756555

Break this problem into two subproblems by setting 
(x + -25) equal to 13.228756555 and -13.228756555.

Subproblem 1

x + -25 = 13.228756555 Simplifying x + -25 = 13.228756555 Reorder the terms: -25 + x = 13.228756555 Solving -25 + x = 13.228756555 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '25' to each side of the equation. -25 + 25 + x = 13.228756555 + 25 Combine like terms: -25 + 25 = 0 0 + x = 13.228756555 + 25 x = 13.228756555 + 25 Combine like terms: 13.228756555 + 25 = 38.228756555 x = 38.228756555 Simplifying x = 38.228756555

Subproblem 2

x + -25 = -13.228756555 Simplifying x + -25 = -13.228756555 Reorder the terms: -25 + x = -13.228756555 Solving -25 + x = -13.228756555 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '25' to each side of the equation. -25 + 25 + x = -13.228756555 + 25 Combine like terms: -25 + 25 = 0 0 + x = -13.228756555 + 25 x = -13.228756555 + 25 Combine like terms: -13.228756555 + 25 = 11.771243445 x = 11.771243445 Simplifying x = 11.771243445

Solution

The solution to the problem is based on the solutions from the subproblems. x = {38.228756555, 11.771243445}

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